Ahh, yes. You are quite right, I did misinterpret Adrienne's post about buring Tin.
Regarding the TLR theory, I haven't decided what I think of it, it's merely another theory I pondered trying to make sense of what little information we have acquired. I have a bunch of theories that prove and disprove each other, I am just trying to fit them together like a puzzle that will eventually fall into place. I fear I will have failed come October 14th, however I am comforted because a voice whispers that another shall finish my work.
My TLR theory was created to make sense of his actions. He gave Allomancy to people he hated, forced his own race into slavery and breeding programs in part to prevent them from breeding with the very same people he gave Allomancy to, which would have produced offspring that could challenge his throne. Why not just withhold Allomancy entirely?
The only confirmation in the book that Rashek was TLR was when Vin whispers 'Rashek' and TLR turns. She accuses him of killing Alendi and then TLR says 'You know nothing!' 'You know nothing of that!' We also have Kwan's mention that he is sending Rashek to kill Alendi and Alendi's journal ending before the asencion, so there are those things.
However this information is offset by TLR's actions and other things in Alendi's journal. Alendi killed his own friends because it was necessary while Rashek always talked about the Terris people being dominant rather than subservient. Alendi wouldn't have to change character to become TLR in book 1, whereas Rashek would have to change dramatically, making his own race subservient when he wished them to be dominant, merely because he decided to give Allomancy to people he hated.
Edit: Please don't read this as I am in support of my theory; I have come up with theories against, like the reason he put the Terris into breeding programs was to breed out the ability to store memories in metalminds, which could be altered by Ruin. I think Brandon even mentions Rashek in one of his annotations, proving that TLR was in fact Rashek, however like I said, most of my theories are trying to make sense of information that doesn't jive. I don't share most of them, the board would be too cluttered.